Added the aria-sort state to the accessibility tree.

content/browser/accessibility/browser_accessibility_win.cc

Index: content/browser/accessibility/browser_accessibility_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_win.cc b/content/browser/accessibility/browser_accessibility_win.cc
index a5501590560641bc29135659cfbbcbfaa15b6bdb..f08375dbf250baa208f172c7f85fe5555fbf7e25 100644
--- a/content/browser/accessibility/browser_accessibility_win.cc
+++ b/content/browser/accessibility/browser_accessibility_win.cc
@@ -3038,8 +3038,6 @@ void BrowserAccessibilityWin::UpdateStep1ComputeWinAttributes() {
     // TODO(nektar): Handle the possibility of having multiple aria-invalid
     // attributes defined, e.g., "invalid:spelling,grammar".
     switch (invalid_state) {
-      case ui::AX_INVALID_STATE_NONE:
-        break;
       case ui::AX_INVALID_STATE_FALSE:
         win_attributes_->ia2_attributes.push_back(L"invalid:false");
         break;
@@ -3070,6 +3068,29 @@ void BrowserAccessibilityWin::UpdateStep1ComputeWinAttributes() {
     }
   }
 
+  // Expose row or column header sort direction.
+  int32 sort_direction;
+  if ((ia_role() == ROLE_SYSTEM_COLUMNHEADER ||
+      ia_role() == ROLE_SYSTEM_ROWHEADER) &&
+      GetIntAttribute(ui::AX_ATTR_SORT_DIRECTION, &sort_direction)) {
+    switch (sort_direction) {
+      case ui::AX_SORT_DIRECTION_UNSORTED:
+        win_attributes_->ia2_attributes.push_back(L"sort:none");
+        break;
+      case ui::AX_SORT_DIRECTION_ASCENDING:
+        win_attributes_->ia2_attributes.push_back(L"sort:ascending");
+        break;
+      case ui::AX_SORT_DIRECTION_DESCENDING:
+        win_attributes_->ia2_attributes.push_back(L"sort:descending");
+        break;
+      case ui::AX_SORT_DIRECTION_OTHER:
+        win_attributes_->ia2_attributes.push_back(L"sort:other");
+        break;
+      default:
+        NOTREACHED();
+    }
+  }
+
   // The calculation of the accessible name of an element has been
   // standardized in the HTML to Platform Accessibility APIs Implementation
   // Guide (http://www.w3.org/TR/html-aapi/). In order to return the